Apparatus and Method for Controlling Transmission of Vehicle

An apparatus and a method for controlling a transmission of a vehicle may include a determining device configured to determine whether a curved road is present within a predetermined distance in front of the vehicle, based on information on a front road, a calculating device configured to correct, based on information on a gradient of the curved road, a vehicle speed in starting cornering of the vehicle on the curved road, determine an expected lateral acceleration based on the corrected vehicle speed and information on a curvature of the curved road, and determine a pattern correcting coefficient based on the determined expected lateral acceleration, a pattern correcting device configured to correct a gearshifting pattern of the transmission, which is preset, based on the pattern correcting coefficient, and a control device connected to the determining device, the calculating device and the pattern correcting device and configured to control the transmission based on the corrected gearshifting pattern when t